533 citations · 6.6k across the 107 of their papers we have counts for
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JWST and ALMA Multiple-Line Study in and around a Galaxy at : Optical to FIR Line Ratios and the Onset of an Outflow Promoting Ionizing Photon Escape
Seiji Fujimoto, Masami Ouchi, Kimihiko Nakajima +33
We present ALMA deep spectroscopy for a lensed galaxy at with whose optical nebular lines and stellar continuum are detec…
On the observability and identification of Population III galaxies with JWST
James A. A. Trussler, Christopher J. Conselice, Nathan J. Adams +6
We utilise theoretical models of Population III stellar+nebular spectra to investigate the prospects of observing and accurately identifying Population III galaxies with JWST using…
Morphologies of Galaxies at Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at
Yoshiaki Ono, Yuichi Harikane, Masami Ouchi +8
We present morphologies of galaxies at resolved by JWST/NIRCam -m imaging. Our sample consists of galaxy candidates identified by stringent dropout and ph…
A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch
Yuichi Harikane, Masami Ouchi, Masamune Oguri +6
We conduct a comprehensive study on dropout galaxy candidates at using the first 90 arcmin JWST/NIRCam images taken by the early release observations (ERO) and earl…
The chemical enrichment in the early Universe as probed by JWST via direct metallicity measurements at z~8
M. Curti, F. D'Eugenio, S. Carniani +30
We analyse the chemical properties of three z~8 galaxies behind the galaxy cluster SMACS J0723.3-7327, observed as part of the Early Release Observations programme of the James Web…
EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy
Kimihiko Nakajima, Masami Ouchi, Yi Xu +13
We present optical-line gas metallicity diagnostics established by the combination of local SDSS galaxies and the largest compilation of extremely metal-poor galaxies (EMPGs) inclu…
EMPRESS. IX. Extremely Metal-Poor Galaxies are Very Gas-Rich Dispersion-Dominated Systems: Will JWST Witness Gaseous Turbulent High-z Primordial Galaxies?
Yuki Isobe, Masami Ouchi, Kimihiko Nakajima +49
We present kinematics of 6 local extremely metal-poor galaxies (EMPGs) with low metallicities () and low stellar masses (). Tak…
Diagnostics for PopIII galaxies and Direct Collapse Black Holes in the early universe
K. Nakajima, R. Maiolino
Forthcoming observational facilities will make the exploration of the early universe routine, likely probing large populations of galaxies at very low metallicities. It will theref…
EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension
Akinori Matsumoto, Masami Ouchi, Kimihiko Nakajima +42
The primordial He abundance is a powerful probe of cosmology. Currently, is best determined by observations of metal-poor galaxies, while there are on…
Strong Lyman continuum emitting galaxies show intense CIV 1550 emission
D. Schaerer, Y. I. Izotov, G. Worseck +7
Using the Space Telescope Imaging Spectrograph, we have obtained ultraviolet (UV) spectra from to 2000 Å of known Lyman continuum (LyC) emitting galaxies at low redshif…
EMPRESS. VII. Ionizing Spectrum Shapes of Extremely Metal-Poor Galaxies: Uncovering the Origins of Strong HeII and the Impact on Cosmic Reionization
Hiroya Umeda, Masami Ouchi, Kimihiko Nakajima +5
Strong high-ionization lines such as HeII of young galaxies are puzzling at high and low redshift. Although recent studies suggest the existence of non-thermal sources, whether the…